Hello Horst, That sounds really nice. If it would be easy to find some motivated OMs in the near field (31km) ;-), that would be an interesting field to test. Yesterday i have thought about possible
Most cave radio work takes place on 87kHz USB although we have sometimes used frequencies as low as 27kHz. The maximum range we have achieved with a 4 W transmitter is about 2 1/2 kilometres. 73 Jo
Hi Rik In a french book called "Poste 85" describing the beginning of the electronics era during WW1 (telephone, radio, gonio, etc) , it is said that it was possible to listen to enemy telephone conv
If I recall correctly, G0AKN (now SK) tried audio frequencies as well as 73 and 136 kHz. G8DSU, who monitors this list, may have more information. An article by G0AKN on this subject appeared in the
Most cave radio work takes place on 87kHz USB although we have sometimes used frequencies as low as 27kHz. The maximum range we have achieved with a 4 W transmitter is about 2 1/2 kilometres. 73 Jo
Hi Jean-Louis and others, If this interests you, there's another book on the same subject: Listening In, by Ernest H. Hinrichs, 148 pp., pub. White Mane Books, Shippensburg, PA, USA (1996). Hinrichs
Hello Stefan, what about "going underground". I do remind an article on communication via some kind of ground antennas in the WW1 (or WW2 ?) trenches (I guess it wasn't very convenient to put up ante
